2. Lacquer paints А. are generally applied on structural steel are less durable as compared to enamel В. paints C. consist of resin and nitro-cellulose D. contain alcohol as thinner E. all the above. Е.

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9. During the operation of an extruder in making thin-walled tubing several defects have been encountered that appear to be small globules of resin. Investigation of these globules reveals that they will soften but not melt when heated. Explain what these globules might be and suggest two possible remedies for eliminating them.

Compare thermoplastic and thermosetting polymers: (a) according of mechanical characteristics upon heating; and (b) on the basis of possible molecular structures.